In addition to infrastructure improvements to better support IIS7, and in addition to toolset enhancements, web developers get 3 new controls in ASP.NET 3.5 (specifically in System.Web.Extensions.dll and specifically in the System.Web.UI.WebControls namespace): ListView, DataPager, and now in Beta 2 we see for the first time LinqDataSource.

To read about ListView and DataPager go to Rick's blog and for LinqDatasource see Scott's blog. In addition to those 2 blog posts, Dan has two excellent videos showing off the controls here and here.